assertEquals("4.0/8.0 kB", format.formatProgress(4000L, 8000L));
        assertEquals("8.0 kB", format.formatProgress(8000L, 8000L));
        assertEquals("8.0/50 kB", format.formatProgress(8000L, 50000L));
        assertEquals("16/50 kB", format.formatProgress(16000L, 50000L));
        assertEquals("50 kB", format.formatProgress(50000L, 50000L));

            builder.append(" ").append(unit.symbol());
        }
    }

    public String formatProgress(long progressedSize, long size) {
        StringBuilder sb = new StringBuilder();
        formatProgress(sb, progressedSize, size);
        return sb.toString();
    }

    public void formatProgress(StringBuilder builder, long progressedSize, long size) {
        if (progressedSize < 0L) {

            builder.append(" ").append(unit.symbol());
        }
    }

    public String formatProgress(long progressedSize, long size) {
        StringBuilder sb = new StringBuilder();
        formatProgress(sb, progressedSize, size);
        return sb.toString();
    }

    public void formatProgress(StringBuilder builder, long progressedSize, long size) {
        if (progressedSize < 0L) {

        assertThrows(IllegalArgumentException.class, () -> format.formatProgress(negativeProgressedSize, 10L));
    }

    @Test
    void testNegativeProgressedSizeBiggerThanSize() {
        FileSizeFormat format = new FileSizeFormat();

        assertThrows(IllegalArgumentException.class, () -> format.formatProgress(100L, 10L));
    }

    static Stream<Arguments> progressedSizeWithoutSizeTestData() {

        if (printResourceNames) {
            status.append(resourceName(resourceName));
            status.append(" (");
        }

        status.append(format.formatProgress(complete, total));

        if (printResourceNames) {
            status.append(")");
        }

        return status.toString();
    }

    private String resourceName(String resourceName) {

                } else {
                    buffer.append(resourceName, idx + 1, resourceName.length());
                }
                buffer.append(" (");
            }

            format.formatProgress(buffer, complete, total);

            if (printResourceNames) {
                buffer.append(")");
            }

            if (entries.hasNext()) {
                buffer.append(" | ");
            }

                return largeFormat.format(scaledSize) + scaledSymbol;
            } else {
                return smallFormat.format(scaledSize) + scaledSymbol;
            }
        }

        public String formatProgress(long progressedSize, long size) {
            if (progressedSize < 0L) {
                throw new IllegalArgumentException("progressed file size cannot be negative: " + progressedSize);
            }